When running, the drill bit should not look like a dog wagging its tail.
I'm not sure about the others, but those of us on other lists who do a lot of precision drilling have found the Dremel to be useless - unless you want a lot of broken bits. It just has too much runout - I measured mine at over .005". I have found Foredom handpieces to be quite acceptable. An old Unimat would also do a good job. The Foredome will cost well over £200. Unimat's have become a bit of a collectors item and cost more than when they were new.
----- Original Message -----
From: Philip Pemberton
To: Homebrew_PCBs@yahoogroups.com
Sent: Thursday, July 14, 2005 3:23 PM
Subject: [Homebrew_PCBs] PCB drill recommendations
[Non-text portions of this message have been removed]